Auxiliary means for leather dressing



Patented a. 21, 1930 UNITED STATES BRUNO REWALD, or HAMBURG, enmuamr- AUXILIARY MEANS FOR LEATHER DRESSING No Drawing. Application filed January 12, 1928, Serial No. 246,400, and in Germany July 16, 1927.

When dressing leather, the greasing of the prepared true skinsis of great importance in order to make them soft and supple. The leather prepared with tanning materials does not easily take up grease,'as the latter does not penetrate forthwith into the pores, but smears only over the surface. In order to obtain the effect aimed at the grease must therefore be provided with an addition of a suit-v able distributing agent; There has hereto-- fore been used for distributing agents, mainly egg-yolk and in some cases Turkeyre'd oil, this latter however has not proved wholly satisfactory but has often produced a subse- 5 quent exudation on the leather. Eg -yolk is furthermore used in dressing glace leather in co-operation with alum, the said egg-yolk being added'to the so-called nourishing'substance which also contains wheat flour. I The term nourishing substance is used in the art to cover a thin pulp containing alum, common salt, wheat flour and egg yolk,

used for dressing kid, etc.

I have now found that for the purpose in question, in place of egg-yolk, phosphatides may be used with great success. The said phosphatides are met with in abundant quantities in numerous vegetable and animal substances, forexample in soybeans. Often the residues which result from the purification of the said phosphatides for human food (in order to remove the substances imparting the'disagreeable smell and taste) can well be used in dressing leather. These residues conph'atides which'products are likewise or at least contain) organic phosphides having a great efiiciency in forming emulsions.

The improved greasing agentsmay be pro- 40 duced, for example, by mixing lecithin of any quality, of animalor vegetable nature, with a fatty oil and using the'mixture. thus obtained for'greasing the leather. In like manner amixture of lecithin and fish oil or train oil (i. e. marine oil) may be produced which mixture is emulsified by. means of fwater and then applied as an emulsion. As lecithin itself is a greasy substance it suflices tain partly decomposed products of the (phosproduct thus obtained without any further addition of grease for greasing the leather.

In'order to obtain a better distribution some alkali (preferably a very little) may be added to the phosphatides of vegetable or animal origin dissolved in oil, before-the mixture is emulslfied with water.

A lasting- (or stable) and very fine emulsion may like- Wise be obtained by adding to the mixture of the phosphatides and fattyoil (or sulphonated fatty ,oil), a little bit of soap.

In the production 'of "the various agents for making emulsions and for greasing leather, the residues obtained by treating, for example, dephlegmated soy-slime'or soymucilage with acetic ether for obtaining vegetable lecithin, may advantageously be employed. The main quantity of the -phos-' phatides is not thereby dissolved; the constituent parts not dissolved are separated and worked up for human food. In the solution, there remains, besides oil, considerable quantities of phosphatides andcleavage. products of the same, which are freed from the acetic ether by distilling.

This residue is emulsified with water, is pro v vided, if convenient or necessary, with a small addition of alkali or ammonia, and maythen be employed as a greasing emulsion.

The variousmixtures may contain in an appropriate manner also a, sulfonatedfatty oilfand 'a phosphatide alone. or withthe ad-. dition ot a fatior mineral oil.

Up to date-in the manufacture of glac leather egg-yolk could not be dispensed with on account of its alum permanency. The. term alum permanency is used in the art to denote that'the substance. when present in the nourishing substance does not become decomposed by reaction with. the alum present therein, to cause a precipitation and separation. But according to the present invention the egg-yolk may be replaced by vegetable or animal phosphatides, if aromatic or aliphatic sulphonic acids are simultaneously added to the nourishing substance in certaincases to produce a solution or as then'agreat alum permanency is attained.-v

50 swelling oflecithin withwater and to use the Furthermore it is advantageous to also add 99 albumen.

T Z]. and alcohol. This for this purpose to the dressed leather, quantities for example 5 to percent of an The albumen obtained from soy beans is especially adapted for this purpose.

In this case the addition of a sulphonic acid is not necessary.

, The invention may be explained with ;-the

help of some examples of execution.

' Example 1 The previously crushed or squashed soybeans are extracted with a mixture ofbensolvent takes up the oil' as well as the phosphatide's and'is'then evaporated. The phosphatides are precipitated in the oil by introducing steam and thereupon separated from the oil. In thusseparating the phosphatides, amount, of oil will be carried by the phosphatides. Much of this oil can be removed from the phosphatides by centrifugal aca v substantial tion, and the phosphatidescan then be freed from any moisture adhering ing.- Thus a fatty mass is obtained which is composed of about 70 parts of. phosphatides and 30parts of soy-oil and which is adapted to further be/mixed with fat oils, for example soy-bean oil and to be adjusted by a sufficient addition of the same in such a manner that the said mass may easily and uniformly be distributed and employed for leather dressing purposes.

-E xampZ e2 v 5 to 10 percent of vegetable lecithin obtained from soy-bean are mix-ed with 90 to 95 percent of fish oil or train oil (marine oil),

which if necessary has been neutralized beforehand with ammonia. The lecithin can be uniformly distributed after which this mixture may be mixed in any desiredproportion with water in order to obtain a lasting emulsion from which the oil does not subsequently separate again.

In order to obviatethe separation of calcium soaps it is convenient tense, in the productlon of .the emulslon, water. free from calcium compounds,.for example, condensed steam. v p

-' Example 3 l0 kgs. vegetable lecithinare mixed with 5 0 to kgs. water atordinary temperature or heated up to 60 to C., whereupon ghrome leather is smeared with this -mixure. v The swelled up mass of vegetable lecithin and water may also be diluted with a greater amount of water, the product thereby obtained may be used for greasing the leather 'in a revolving cask or drum. The lecithin penetrates into the pores of the skin and gives the leather the desired soft and supple qualitfi small there-to by d in the train oil,

Example 4 2kgs. of the phosphatides obtained from soy-beans by lixivi'ating the, same with a benzol-a-lcohol mixture, are mixed with 6 kgs. of neats-foot oil and then-heated on the water bath to 40 to 50 0., until a perfect solution is produced. From this solution there may if desired, be produced a uniform emulsion, by

the addition of alittle bit of ammonia or soda lye and warm water. This emulsion is run into a revolving-drum containin'g 250 kgs. chrome leather and. 500 to- After the I 1,000 kgs. of'cold orwarm water. drum has been rotated for three-quarters of an hour, the grease will be found to'have been-fully taken up by the leather.

\ Example 5 100 kgs, of soy-mash obtained from tracted oil of soy-beans, is dephlegmated and treated with 300 litres of acetic ether. By ,this procedure most all of the phosphatides is separated which may be worked up by further treatment for articles of human leather.

Example 6 a small addition of am monia or alkali, a. lasting emulsion is ob tained, which may be used for greasing food. Considerable quantities of phosphar 2 30 parts of phosphatides obtained from soy-beans are mixed with 5 parts of an arovmatic sulfonic acid, for example sulphonated butylsnaphthalene and dissolved in.

100 parts of water. The thus obtained-sub stance be used with success as a substitute for egg- .yolk' in producing for glac leather, especially with an addition of 5 to 10 percent of the albumen extracted from soy-beans.

--Exampl7,

30 parts of aving a full alum-permanencymay oil-containing soy-lecithin the nourishing substance v having a proportion of 30 percent of lecithin.

are mixed with 3'parts of'veg'etable albumen, 67.;parts of water'and 3 parts of a 5% soda lye. 9f this mixture 30 parts are diluted with 300parts of water whereupon 50 partsof alum, 15 parts of common salt and 50 parts of'wheat flour are added. This mixture is used'in the dressing of glac leather as the nourishing substance.

c lixample 8. 'A mixture is produced of 1 phosphati'de, 0.3 parts of potash soap, 2

part of soy- 10. The herein escribed mode of then further quantities of water added un-' til the desired dilution is attained.

- For carrying the invention into practice, all organic phosphorus compounds of fatty character designated as lecithin or phosphatides and the phosphorus-containing cleavage products thereof, can be employed. The expression phosphatide-like material as hereinafter used, is intended to cover such materials. I

The term animal phosph'atides as used herein, is not intended to cover egg. yolk or 15 materials produced from egg yolk. No claim is made hereinto compositions in whichthe whole or the main part of the phosphatides present is'derived from egg yolk,

I, claim 1. The herein described mode of dressing ,leather which comprises impregnating the leather witha.materialincluding a phosphatide of, vegetable origin. I I

2. The herein described mode of dressing leather which comprises impregnating the leather with a material including a phos- 'pliatide of vegetable origin and a marine 3. The herein described mode of dressing leather which comprises impregnating the leather with a material includin an emulsion containing a phosph'atide o vegetable origin. 1

.4. The herein described mode of dressing leather which-comprises impregnating .the leather with an emulsion including a phospliatidef-rom a vegetable material and train o1 v 5. The herein described mode of dressing leather which comprises impregnating the leather with a composition including a phosphatide from a vegetable material, and an oily material.

45 6. The herein described mode of dressing leather which comprises impregnating thev leather with a composition including phosphatide-like inaterial from soy beans and an "oil material. 7. e herein described mode of leather which comprises impregnati leather with a composition including o hos- .phatide-like material from soy beans'and a -attyoil. 4. 8. The herein described mode of dressing leather which comprises impregnating the leather with an emulsion including water and phosphatide-like material from vegetable'oil-bearing seeds and an oilymaterial.

9. The herein described mode of dressing leather which comprises impregnating the leather with an emulsion including water and thephosphatide-like.material from soy beans,' and an oil material.

leather with :a material includin leather which comprises impregnatinghthe p osphatide-like material from a vegeta le substance and an oily material and an albumin. 11.. The herein described mode of dressing leather which comprises impregnating the leather with a material includin phosphatide-like material from a vegeta 1e, substance and an oily material and an alkaline substance. 3

12. The herein. described mode of, dressing leather which comprises impregnating the leather with an emulsion including soy-, bean 'phosphatide, oily material, albumin, alkali and water. J

13. The herein described mode of dress ing leather which comprises impregnating the leather with a material including a phosphatide from an oil-bearing legummous seed, an oil and a saponaceous material.

14. The herein described mode of dressing leather which comprises impregnating the.

leather with an emulsion including water and the phosphatide-like material from soybeans, and train oil.

15. The herein described mode of dressing leather which comprises impregnating the leather with a material including phospha tide-like material from a vegetable substance and train oil.

'16. The herein described mode of dressing leather which comprises im regnating the "leather with a material inc udmg a phos phatide from an oil-bearin legummous seed and a sulphonated fatty oil. 17. The herein descrlbed mode of dressing leather which com rises impregnating the leather with a mate'rlal including a phosphatide from an oil-bearing le minous seed and a sulphonated body whic can readily, mix therewith.

v18. A process which comprises the ste of dressing leather with an emulsion inclu g a hosp'hatide from oil-bearing seed and an oi y material which includes a sulphonated organic material.

19. A process which comprises the step of dressing, leather with an emulsion includin a phosphatide -from oil-bearing seed an an oily material which includes a sulphonated organic material and a marine 011.

20. The herein described mode of dress ing leather which eomprises. impregnatmg the leather with a material including a easy material including a phosdphatide rom an oil-bearing le mmous' see In testimony whereo I aflix my signature.

- BRUNO nEwa n. 

